Head to head
Glow-worm Energy Combi 25C 25kW vs Heatrae Sadia Megaflo Eco 170
The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kw hot water output. The Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres.
Last reviewed 13 September 2026
Specifications side by side
| Glow-worm Energy Combi 25C 25kW | Heatrae Sadia Megaflo Eco 170 | |
|---|---|---|
| Dimensions | 700 x 390 x 280 mm | 1384 x 579 x 600 mm (H x W x D) |
| Warranty | 7 years | Lifetime guarantee in domestic installations |
| Hot water output | 25.7 kW | - |
| Central heating output | 18 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 94% | - |
| Weight | 32 kg | - |
| Hot water flow rate | 10.4 litres per minute | - |
| Capacity | - | 170 litres |
| Heat-up time | - | 22 minutes (15 L/min recovery, 15C to 60C) |
| Max inlet pressure | - | 1.6 MPa (16 bar) |
| Immersion heater | - | 3kW incoloy immersion, back-up |
Sources: Glow-worm Energy Combi 25C 25kW, Heatrae Sadia Megaflo Eco 170. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Energy Combi 25C 25kW if...
A gas combi boiler with 25.7 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.4 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 94%.
Full Energy Combi 25C 25kW specifications →Buy or hire the Megaflo Eco 170 if...
A 170 litre indirect unvented cylinder from Heatrae Sadia's Megaflo Eco range, one of the most fitted cylinder brands in the UK. It reheats in about 22 minutes at a 15 litre/min flow rate and carries a lifetime guarantee in a domestic installation.
Full Megaflo Eco 170 specifications →Common questions
What is the difference between the Glow-worm Energy Combi 25C 25kW and the Heatrae Sadia Megaflo Eco 170?
The Glow-worm Energy Combi 25C 25kW is a gas combi boiler, 25.7 kW hot water output; the Heatrae Sadia Megaflo Eco 170 is a indirect unvented hot water cylinder, 170 litres.
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